METHOD OF PERFORMING LINK ADAPTATION PROCEDURE

• US 20120063439A1
• Filed: 11/18/2009
• Published: 03/15/2012
• Est. Priority Date: 06/23/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seok, Yong Ho
• Granted Patent: US 8,634,395 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 8/24 Transfer of terminal data
• CPC Class Codes: H04W 84/105 PBS [Private Base Station] network H04W84/12 - H04W84/16 take precedence
• CPC Class Codes: H04W 84/12 : WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A method of performing a link adaptation procedure for multi-user transmission in a wireless local area network (WLAN) system is provided. The method includes receiving a modulation and coding scheme (MCS) feedback request transmitted by an access point (AP) to a plurality of stations, estimating an MCS by considering a spatial stream corresponding to the MCS feedback request transmitted to the other stations, and transmitting an MCS feedback response comprising the estimated MCS to the AP. The link adaptation procedure can be performed by considering a wireless communication environment on a real time basis.

Claims

1-14. -14. (canceled)

15. A method of communicating in a wireless local area network system by a mobile station, the method comprising:

receiving and decoding, by the mobile station, a first data unit transmitted by an access point (AP) via multi-user multiple input/multiple output (MU MIMO) transmission to a plurality of mobile stations,

wherein the first data unit includes a channel estimation information used for estimating a channel for each of the plurality of mobile stations, and a first identifier identifying the plurality of stations.

16. The method of claim 15, the method further comprising:

determining, by the mobile station, that the mobile station is among the plurality of stations indicated by the first identifier,

wherein the first identifier is transmitted in a physical layer convergence procedure (PLCP) header of the first data unit.

17. The method of claim 16, further comprising:

transmitting, by the mobile station, a second data unit to the AP,

wherein the second data unit includes a MAC header containing channel information estimated based on the channel estimation information, and

the second identifier obtained from the first identifier.

18. The method of claim 15, wherein the first data unit further includes a MAC header containing a modulation and coding scheme (MCS) feedback request transmitted by the access point (AP) to the plurality of mobile stations.

19. The method of claim 18, further comprising:

transmitting a response data unit in response to the MCS feedback request,

wherein the response data unit includes channel information estimated based on the channel estimation information, and the first identifier.

20. A wireless apparatus of communicating in a wireless local area network system, the apparatus comprising a processor configured to:

receive and decode a first data unit transmitted by an access point (AP) via multi-user multiple input/multiple output (MU MIMO) transmission to a plurality of mobile stations,

wherein the first data unit includes a channel estimation information used for estimating a channel for each of the plurality of mobile stations, and a first identifier identifying the plurality of stations.

21. The apparatus of claim 20, the processor further configured to:

determine that the mobile station is among the plurality of stations indicated by the first identifier,

wherein the first identifier is transmitted in a physical layer convergence procedure (PLCP) header of the first data unit.

22. The apparatus of claim 21, the processor further configured to:

transmit a second data unit to the AP,

wherein the second data unit includes a MAC header containing channel information estimated based on the channel estimation information, and

the second identifier obtained from the first identifier.

23. The apparatus of claim 20, wherein the first data unit further includes a MAC header containing a modulation and coding scheme (MCS) feedback request transmitted by the access point (AP) to the plurality of mobile stations.

24. The apparatus of claim 23, the processor further configured to:

transmit a response data unit in response to the MCS feedback request,

wherein the response data unit includes channel information estimated based on the channel estimation information and the first identifier.